Twin studies powerpoint
When looking at how the biological level of analysis carries out research to support genetic theories of behaviour, students need to understand the concept of "correlational research." One of the ways to do this is to look at twin studies.
Attached is a simple power-point presentation on twin studies. The key ideas of this power-point are:
Genetic studies look at concordance rates - that is, the degree to which traits between identical twins (MZ), fraternal twins (DZ), or siblings are similar.
Adoption studies are often used because they help to determine the extent to which environment plays a role in development.
Prospective studies are longitudinal studies which follow a participant who is believed to be genetically vulnerable for a certain trait to see if that trait does indeed manifest itself over time - and what may be the "trigger" that actually activates the trait.
There are serious ethical concerns with twin studies and prospective studies. They may lead to iatrogenic effects - that is, the goal of prevention may actually lead to a self-fulfilling prophecy where the individual develops the traits simply because s/he believes that they will manifest.
There are sampling problems with twin studies. They may not be generalizable to the larger human population.
A good study to consider is the Minnesota Twin Study. A good link for this study can be found at: University of Minnesota website